JarCasting
JarCasting JarCasting

com.michaelpollmeier:bctrace

Extensible java agent framework to instrument programs running on the JVM

License

License
GroupId

GroupId

com.michaelpollmeier
ArtifactId

ArtifactId

bctrace
Last Version

Last Version

0.0.1
Release Date

Release Date
Type

Type

pom
Description

Description

com.michaelpollmeier:bctrace
Extensible java agent framework to instrument programs running on the JVM
Project URL

Project URL

https://github.com/ShiftLeftSecurity/bctrace
Source Code Management

Source Code Management

https://github.com/ShiftLeftSecurity/bctrace

Download bctrace

Filename Size
bctrace-0.0.1.pom 7 KB
Browse

How to add to project

<!-- https://jarcasting.com/artifacts/com.michaelpollmeier/bctrace/ -->
<dependency>
    <groupId>com.michaelpollmeier</groupId>
    <artifactId>bctrace</artifactId>
    <version>0.0.1</version>
    <type>pom</type>
</dependency>
// https://jarcasting.com/artifacts/com.michaelpollmeier/bctrace/
implementation 'com.michaelpollmeier:bctrace:0.0.1'
// https://jarcasting.com/artifacts/com.michaelpollmeier/bctrace/
implementation ("com.michaelpollmeier:bctrace:0.0.1")
'com.michaelpollmeier:bctrace:pom:0.0.1'
<dependency org="com.michaelpollmeier" name="bctrace" rev="0.0.1">
  <artifact name="bctrace" type="pom" />
</dependency>
@Grapes(
@Grab(group='com.michaelpollmeier', module='bctrace', version='0.0.1')
)
libraryDependencies += "com.michaelpollmeier" % "bctrace" % "0.0.1"
[com.michaelpollmeier/bctrace "0.0.1"]

Dependencies

There are no dependencies for this project. It is a standalone project that does not depend on any other jars.

Project Modules

  • bootstrap
  • core
  • runtime
  • spi
  • archetype

Maven Central

io.shiftleft:bctrace

An extensible framework for creating production-ready java agents.

bctrace exposes a simple event-driven programming model, built around the Hook abstraction, and saves the developer from the complexity of dealing with bytecode manipulation.

Instrumentation primitives

  • Notifying events to hook listeners in the case of
    • Method just started
    • Method about to return
    • Method about to rise a Throwable
    • Call site about to be invoked
    • Call site just returned
    • Call site just raised a Throwable
  • Changing runtime data:
    • Method/call-site (about to be) passed arguments
    • Method/call-site (about to be) returned value
    • Method/call-site (about to be) thrown Throwable

Features

  • Battle tested and production-ready
  • Generic vs direct APIs (this last suited for instrumenting hot spot methods)
  • Automatic packaging of dependencies
  • Supports filtering based on class hierarchy
  • Off-heap classloading, that ensures no side effects in the target application
  • Ensures no recursive event notifications are triggered from listener code
  • Ensures no exceptions raised by listeners reach the application
  • JMX metrics
  • Extensible
    • Logging
    • Help menu

Getting started

Bootstraping a new agent project

Set the coordinates for you new agent project

export ORG_ID=org.myorganization
export ARTIFACT_ID=test-agent
export VERSION=0.0.0-SNAPSHOT

Generate the project into a new folder of the current directory by using the provided archetype:

mvn archetype:generate -B \
-DarchetypeGroupId=io.shiftleft \
-DarchetypeArtifactId=bctrace-archetype \
-DarchetypeVersion=0.0.0-SNAPSHOT \
-DgroupId=$ORG_ID \
-DartifactId=$ARTIFACT_ID \
-Dversion=$VERSION

Move to the new agent project root folder

cd $ARTIFACT_ID

And build it

mvn clean package

Project structure

The newly created agent project is a multi-module Maven project, than contains

  • /agent: The agent module.
  • /playground: Several target applications to test instrumentation.

Running the agent

Run the /playground/hello-word test application:

$ java -jar playground/hello-world/target/$ARTIFACT_ID-playground-hello-world-$VERSION.jar

Hello world!

By default, the generated agent defines two hooks:

Now, run it again, attaching the agent, and compare the results:

$ java -javaagent:agent/target/$ARTIFACT_ID-$VERSION.jar -jar playground/hello-world/target/$ARTIFACT_ID-playground-hello-world-$VERSION.jar

INFO 1554349422236 Starting bctrace agent ...
INFO 1554349422267 Created String instance: "playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar"
INFO 1554349422267 Created String instance: "playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar"
INFO 1554349422267 Created String instance: "META-INF/MANIFEST.MF"
INFO 1554349422268 Created String instance: "Manifest-Version"
INFO 1554349422268 Created String instance: "1.0"
INFO 1554349422268 Created String instance: "Archiver-Version"
INFO 1554349422268 Created String instance: "Plexus Archiver"
INFO 1554349422268 Created String instance: "Built-By"
INFO 1554349422268 Created String instance: "nacho"
INFO 1554349422268 Created String instance: "Created-By"
INFO 1554349422268 Created String instance: "Apache Maven 3.5.4"
INFO 1554349422269 Created String instance: "Build-Jdk"
INFO 1554349422269 Created String instance: "1.8.0_191"
INFO 1554349422269 Created String instance: "Main-Class"
INFO 1554349422269 Created String instance: "org.myorganization.testagent.playground.helloworld.Main"
INFO 1554349422269 Created String instance: "org/myorganization/testagent/playground/helloworld/Main"
INFO 1554349422269 Created String instance: "org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422269 Created String instance: "org/myorganization/testagent/playground/helloworld/Main"
INFO 1554349422269 Created String instance: "org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422269 Created String instance: "org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422270 Created String instance: "org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422270 Created String instance: "org/"
INFO 1554349422270 Appending "" + "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!/"
INFO 1554349422270 Appending "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!/" + "org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422270 Created String instance: "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!/org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422270 Created String instance: "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!"
INFO 1554349422270 Created String instance: "/org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422270 Appending "" + "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!"
INFO 1554349422271 Appending "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!" + "/org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422271 Created String instance: "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar!/org/myorganization/testagent/playground/helloworld/Main.class"
INFO 1554349422271 Created String instance: "org.myorganization.testagent.playground.helloworld"
INFO 1554349422271 Created String instance: "META-INF/MAVEN/"
INFO 1554349422271 Created String instance: "META-INF/MAVEN/ORG.MYORGANIZATION/"
INFO 1554349422271 Created String instance: "META-INF/MAVEN/ORG.MYORGANIZATION/TEST-AGENT-PLAYGROUND-HELLO-WORLD/"
INFO 1554349422271 Created String instance: "META-INF/MAVEN/ORG.MYORGANIZATION/TEST-AGENT-PLAYGROUND-HELLO-WORLD/POM.XML"
INFO 1554349422271 Created String instance: "META-INF/MAVEN/ORG.MYORGANIZATION/TEST-AGENT-PLAYGROUND-HELLO-WORLD/POM.PROPERTIES"
INFO 1554349422272 Created String instance: "Manifest-Version"
INFO 1554349422272 Created String instance: "1.0"
INFO 1554349422272 Created String instance: "Archiver-Version"
INFO 1554349422272 Created String instance: "Plexus Archiver"
INFO 1554349422272 Created String instance: "Built-By"
INFO 1554349422272 Created String instance: "nacho"
INFO 1554349422272 Created String instance: "Created-By"
INFO 1554349422272 Created String instance: "Apache Maven 3.5.4"
INFO 1554349422272 Created String instance: "Build-Jdk"
INFO 1554349422272 Created String instance: "1.8.0_191"
INFO 1554349422272 Created String instance: "Main-Class"
INFO 1554349422272 Created String instance: "org.myorganization.testagent.playground.helloworld.Main"
INFO 1554349422272 Created String instance: "org/myorganization/testagent/playground/helloworld"
INFO 1554349422272 Created String instance: "org/myorganization/testagent/playground/helloworld/"
INFO 1554349422273 Created String instance: "org/myorganization/testagent/playground/helloworld"
INFO 1554349422273 Created String instance: "org/myorganization/testagent/playground/helloworld/"
INFO 1554349422273 Created String instance: "org/myorganization/testagent/playground/helloworld"
INFO 1554349422273 Created String instance: "org/myorganization/testagent/playground/helloworld/"
INFO 1554349422273 Created String instance: "org.myorganization.testagent.playground.helloworld"
INFO 1554349422273 Created String instance: "file:/tmp/test-agent/playground/hello-world/target/test-agent-playground-hello-world-0.0.0-SNAPSHOT.jar"
INFO 1554349422274 Appending "" + "Hello "
INFO 1554349422274 Appending "Hello " + "world"
INFO 1554349422274 Appending "Hello world" + "!"
INFO 1554349422274 Created String instance: "Hello world!"
Hello world!
INFO 1554349422274 Appending "" + ""
INFO 1554349422274 Appending "" + ".level"
INFO 1554349422275 Created String instance: ".level"

Congratulations, your bctrace agent is up and running (and ready to grow)!

Next steps

Explore the agent documentation

Main stack

This module could not be possible without:

Authors

License

Based on brutusin:instrumentation by Ignacio del Valle Alles distributed under Apache v2.0 license.

Creating a release

VERSION="0.0.1"
mvn versions:set -DnewVersion=$VERSION
mvn versions:commit
git add pom.xml */pom.xml
git commit -m "updating version to $VERSION"
git tag v$VERSION
mvn clean test javadoc:jar deploy
git push origin v$VERSION
com.michaelpollmeier

ShiftLeft Inc.

Versions

Version
0.0.1